[PATCH v2 1/2] drm: Add drm_crtc_vblank_waitqueue()

ville.syrjala
2014-05-22T16:36:03Z

From: Ville Syrjälä <ville.syrjala@linux.intel.com>

Add a small static inline helper to grab the vblank wait queue based on
the drm_crtc.

This is useful for drivers to do internal vblank waits using
wait_event() & co.

v2: Pimp commit message (Daniel)
Add kernel doc (Daniel)

Suggested-by: Daniel Vetter <daniel@ffwll.ch>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
---
Documentation/DocBook/drm.tmpl | 1 +
include/drm/drmP.h | 11 +++++++++++
2 files changed, 12 insertions(+)

diff --git a/Documentation/DocBook/drm.tmpl b/Documentation/DocBook/drm.tmpl
index 9574bf2..527a3f9 100644
--- a/Documentation/DocBook/drm.tmpl
+++ b/Documentation/DocBook/drm.tmpl
@@ -2522,6 +2522,7 @@ void (*disable_vblank) (struct drm_device *dev, int crtc);</synopsis>
<sect2>
Vertical Blanking and Interrupt Handling Functions Reference
!Edrivers/gpu/drm/drm_irq.c
+!Iinclude/drm/drmP.h drm_crtc_vblank_waitqueue
</sect2>
</sect1>

diff --git a/include/drm/drmP.h b/include/drm/drmP.h
index 76ccaab..48dc3e5 100644
--- a/include/drm/drmP.h
+++ b/include/drm/drmP.h
@@ -1378,6 +1378,17 @@ extern int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
extern void drm_calc_timestamping_constants(struct drm_crtc *crtc,
const struct drm_display_mode *mode);

+/**
+ * drm_crtc_vblank_waitqueue - get vblank waitqueue for the CRTC
+ * @crtc: which CRTC's vblank waitqueue to retrieve
+ *
+ * This function returns a pointer to the vblank waitqueue for the CRTC.
+ * Drivers can use this to implement vblank waits using wait_event() & co.
+ */
+static inline wait_queue_head_t *drm_crtc_vblank_waitqueue(struct drm_crtc *crtc)
+{
+ return &crtc->dev->vblank[drm_crtc_index(crtc)].queue;
+}

/* Modesetting support */
extern void drm_vblank_pre_modeset(struct drm_device *dev, int crtc);
--
1.8.5.5

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